How many coats of spar varnish?

[icemac33]

I've got the first two pieces of my boat floor cut and I have a couple coats of spar varnish on. I'm using 3/4" untreated ply. How many coats should I give them?

[iffy]

AT least 2. But more will give you more protection. It will need to be done yearly though. Why not just carpet the floor?

[icemac33]

I'm going to carpet also. I'm putting a flat floor in my v-hull lund and need to protect the new wood from water also.

[DonBo]

IMO you need at least 4 coats to protect it under carpet, even then I don't believe long term looks good...You should have started with treated or marine ply.